GJ MacRae Foundation Repair

The Original Wetbasements Experts – Since 1975

The GTA's Most Valuable Warranty

Servicing Toronto, Mississauga, Oakville, Burlington, Milton, Hamilton and Georgetown

We've Completed Over 10,000 Projects Since 1975

GJ MacRae is a pioneer in the GTA with nearly 50 years of experience and 10,000+ warranties issued to date. Even though a warranty is only as meaningful as the company that issues it, we don’t simply issue a document; we issue an authentic guarantee, which translates into the most reliable and time-tested basement waterproofing warranty available today.

we are the originals

We Are The Originals

GJ MacRae retains the highest quality transferable waterproofing warranty in the GTA, so be aware of the hidden terms and conditions that come with lifetime warranties.

40 year legacy

A 48 Year History

We've been an active family business for nearly five decades, and no one has been waterproofing or underpinning foundations in the GTA longer than the team at GJ MacRae!

family owned

Truly Family Owned

GJ MacRae is truly a family owned and operated basement waterproofing and foundation repair company.


10,000+ Warranties

With over 10,000+ warranties issued to date, no other company can match our degree of waterproofing dependability.


Our Only Specialty

Foundations are all we do! We began in 1975 and continue to lead the industry with quality workmanship and guaranteed results.

knowledge longevity

Knowledge and Longevity

With nearly five decades in the trenches, you can trust our specialized knowledge. Let our longevity work for you!


Industry Pioneers

We were the first contractors in the GTA to introduce the novel overflow underpinning method.


Customer Service

Award-winning customer service, quick response times, and free estimates make us the perfect fit for your project.


Here For The Long Run

After nearly half a century in business, we're in it for the long run. There are no quick fixes here, only lasting results.


We Love What We Do!

Yes, we genuinely love what we do! Basement waterproofing, foundation repair, and underpinning are our forté!


Indeed, the most critical long-term factor that should be considered when choosing a foundation waterproofing contractor is the warranty issuance and what that may mean in the long term.

In the last five years, we have noticed that everyone with a pickup truck, rubber boots, and a shovel is now a basement waterproofer. This trend comes and goes every few years. Coupled with misdiagnosis, improper repair and materials approach, and poor quality workmanship, the individual who pays most for this unrelenting market saturation is you, the customer.

Every year, Google becomes populated with a plethora of contractors and “family-run businesses”, all of which have been waterproofing for a century while carrying 100-year warranties, and so on. Let’s face it: you get what you pay for. Complex waterproofing and drainage considerations coupled with a high degree of difficulty and slim margins for error usually drive these contractors out of business quickly. The result? They close their doors and shut off their phones, leaving their warranty void and the customer stranded. Beware of empty, long-term warranty promises and fly-by-night contractors.

Waterproofing and drainage considerations throughout the province haven’t changed in decades (albeit more is now required). Still, nearly every trade show we attend is full of new products, materials, and techniques for cheap and quick waterproofing and structural repairs. Trust us, if there were an easier way aside from complete excavation to establish a genuine, lasting warranty, we would know about it!

The residential waterproofing industry has quadrupled in product scope and size throughout the last ten years. Even big-box stores now carry plastic sump pumps and low-quality rubberized membranes. Remember, in this overly saturated industry, you purchase peace of mind through a dependable, long-lasting, guaranteed warranty process.

But don’t take our word for it; check out our online reviews to see what our customers have to say!


Why Choose GJ MacRae?

inside basement waterproofing

Protect Your Foundation

Our Services Are Trusted By

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What Does quality Foundation Repair Look Like?



Expert Waterproofing Services for Your Home

GJ MacRae Foundation Repair has been the industry leader for reliable basement waterproofing in the Greater Toronto Area Since 1975. Nearly five decades of experience inform our proven multi-stage repair process based on below-grade drainage considerations that allow us to waterproof concrete blocks, poured walls, and stone rubble foundation walls properly for the long term. Our repair solutions for leaking foundation cracks include using bitumen-based barrier membranes and high-efficiency weeping tile systems, which give us the edge in reliability and allow for the most robust foundation repair warranty available today in the GTA. Experience the GJ MacRae difference for year-round basement leak repairs in Toronto, Oakville, Mississauga, Burlington, Hamilton, Milton, and Georgetown. If you spot cracked foundation walls, leaky foundations, or any other basement waterproofing issues in your house, reach out and call us today at (905) 824-2557.

Quality Foundation Repair Done Right.


Download Our Free eBook

We’re honored to provide these resources to help you on your journey, and we know reputations are hard to build and easy to lose. That’s why our business is built around two simple promises:

Honesty and Transparency.

We genuinely want each step of your journey (from the very first Google search to a leak-free basement) to be positive!

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